Paper, 'A proposition relating to the combination of transparent lens's with reflecting planes' by J [John] Hadley After proposing the use of a telescope with an instrument for taking angles, Hadley considers the effects of combining several kinds of telescopes with reflecting planes. He proposes placing lenses of equal focal length in such a way as to affect the angle of light which passes through them. Includes four diagrams. Subject: Optics Published in Philosophical Transactions as 'A proposition relating to the combination of transparent lens's with reflecting planes'. Read to the Royal Society on 9 January 1734. [1734]